The Trust-O-Meter™ gives a pretty good indication of how much I am going to trust something. There are good things, which tend to inspire trust. And there are bad things which tend to reduce or eliminate trust.
One of the great things that you can do that will inspire trust is to provide links. If I can verify what you say for myself, I am more likely to trust you on other matters. (Some caution is necessary. If I think a link is suspicious, it won’t help. Worse, if you make claims about A, B, and C that I know to exist but don’t know the claims as true and X, Y, and Z that I have never heard of and only provide links for the X, Y, and Z claims, it will actually move you down.) Another good thing is to correctly report something I already know but which you don’t know I already know. Also good is to admit when you are wrong.
One bad thing that you can do is only to link to yourself or your supporters. If you tell me that some prominent person said X, I want a link to his website saying X or a video of him saying X. Now, I realize that sometimes there is a game of “hide the evidence.” But you and your supporters linking to each other to make the claim just doesn’t help anything. Moderating comments is a big red flag. While there are occasionally reasons to moderate comments, the purpose is usually better served by removing derailing or disruptive comments after the fact. If you are screening comments before anyone can see them, there is a good chance you are throwing away the inconvenient ones. Getting caught in a lie is a great way to hurt your credibility. That goes double if you lie about the very people you are trying to convince.
Then there are things which ensure that you will have no credibility whatsoever. Calling dissenters “X deniers” is a fine example. Presuppositional Baloney operates on this. You can also create an echo chamber. When there are a lot of comments, but no dissent, something is wrong. However, it is sometimes good to test this by leaving a dissenting comment and seeing what happens to it. Incidentally, creating “straw dissenters” whose purpose is to be obviously absurd is not of any help. If you play a game of “hide the evidence” your credibility is gone. If you used to have a website but you took it down because you couldn’t handle criticism (especially links proving you said something inconvenient) then everyone that knows you did that will never trust you.